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Summary of significant accounting policies (Policies) | 6 Months Ended
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Jun. 30, 2022
Summary of significant accounting policies |
Basis of preparation | 2.1 Basis of preparation ​ The Company prepared these unaudited consolidated financial statements in compliance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the SEC regarding interim financial reporting. Any reference in these notes to applicable guidance is meant to refer to authoritative U.S. GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards Board (“FASB”). ​ The unaudited consolidated financial statements are presented in U.S. dollars, except where otherwise indicated. Transactions denominated in currencies other than U.S. dollars are presented in the transaction currency with the U.S. dollar amount included in parenthesis, converted at the foreign exchange rate as of the transaction date.
Unaudited interim financial information | 2.2 Unaudited interim financial information ​ The interim financial statements and related disclosures are unaudited, have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the financial position, results of operations and changes in financial position for the period presented. ​ Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been omitted. The results of operations for the three and six months ended June 30, 2022, are not necessarily indicative of the results to be expected for the full year ending December 31, 2022, or for any other future year or interim period. The accompanying financial statements should be read in conjunction with the audited financial statements and the related notes thereto included in the Company’s Annual Report.
Use of estimates | 2.3 Use of estimates ​ The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. ​
Accounting policies | 2.4 Accounting policies ​ The principal accounting policies applied in the preparation of these unaudited consolidated financial statements are described in the Company’s audited financial statements as of and for the year ended December 31, 2021, and the notes thereto, which are included in the Company’s Annual Report. There have been no material changes in the Company’s significant accounting policies during the six months ended June 30, 2022, except as noted below. ​ Inventory ​ The Company started producing commercial materials in April 2022 to supply CSL Behring LLC (“CSL Behring”) with etranacogene dezaparvovec (the “Product”) in accordance with the June 2020 Development and Commercial Supply Agreement between the Company and CSL Behring. From this date onwards, the Company presents the costs associated with the aforementioned activities as cost of contract manufacturing. The Company capitalizes inventory to be sold to CSL Behring to the extent it expects to generate probable future benefits from such sales. Refer to Note 3, “CSL Behring collaboration” for further detail. ​ Per ASC 330, Inventory, inventory is stated at the lower of cost or estimated net realizable value, on a first-in, first-out basis. The Company uses standard costs, approximating average costs to determine its cost basis for inventories. The Company’s assessment of market value requires the use of estimates regarding the net realizable value of its inventory balances, including an assessment of excess or obsolete inventory. As applicable, write-downs resulting from adjustments to net realizable value will be recorded to cost of contract manufacturing. ​
Recent accounting pronouncements | 2.5 Recent accounting pronouncements ​ There have been no new accounting pronouncements or changes to accounting pronouncements during the six months ended June 30, 2022, as compared to the recent accounting pronouncements described in Note 2.3.23 of the Company’s Annual Report, which could be expected to materially impact the Company’s unaudited consolidated financial statements.

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